Fluorine Resin Characteristics

Item Unit ASTM test method Teflon (PTFE)
 Teflon (FEP)
 Teflon (PFA)
 Teflon, Tefzel (ETFE)

 Other fluorine resins
CTFE VDF
Physical characteristics Specific gravity D792 2.14 to 2.20 2.12 to 2.17 2.12 to 2.17 1.70 2.1 to 2.2 1.75 to 1.78
Melting point °C 327 253 to 282 302 to 310 270 210 to 212 170
Mechanical characteristics Tensile strength kg/cm2 D638 280 to 350 200 to 320 320 455 315 to 420 400 to 520
Elongation % D638 200 to 400 250 to 330 280 to 300 200 80 to 250 600
Compressive strength kg/cm2 D695 120 150 – 500 320 to 520 600
Tensile modulus of elasticity 103 kg/cm2 D638 4 3.5 – 8.4 10.5 to 21 8.4
Flexural modulus of elasticity 103 kg/cm2 D790 3.5 to 6.3 6.7 6.7 to 7.0 14 – 14.0
Impact strength (Izod)
 kg·cm/cm D256 16.3 No break No break No break 13.6 to 14.7 19.6 to 21.8
Hardness Rockwell D785 R25 R25 – R60 R75 to R95 R110 to R115
Hardness Durometer D1706 D55 D55 D60 D75 – D80
Coefficient of static friction – 0.05 – – – 0.25 0.10
Coefficient of dynamic friction
(7 kg/cm2)
(3 m/minute)		 – 0.10 0.3 0.2 0.4 0.37 0.39
Thermal properties Thermal conductivity 10-4
cal/cm·sec·°C		 D177 5.9 6.0 6.2 5.7 4.7 to 5.3 3.0
Specific heat cal/°C/g 0.25 0.28 0.25 0.46 to 0.47 0.22 0.33
Coefficient of linear thermal expansion 10-5/°C D696 9.9
(23 to 66°C)		 8.3 to 10.5
(-72 to 71°C)		 12
(21 to 100°C)		 9 to 9.3
(20 to 90°C)		 4.5 to 7.0 8.5
°C 260 200 260 150 180 to 200 150
Heat distortion temperature 4.6 kg/cm3 °C D648 121 72 – 104 125 149
18.5 kg/cm3 °C D648 55 50 – 74 – 90
Electrical properties Volume resistivity Ω·cm D257 > 1018 > 1018 > 1018 > 1016 1.2 × 1018 2.0 × 1014
Surface resistivity Ω D257 > 1016 > 1018 > 1016 5 × 1014 – –
Dielectric breakdown strength
 (1/8 inch thickness)
kV/mm		 D149 16 to 24 20 to 24 20 to 24 16 20 to 24 10.4
Dielectric constant 60 Hz D150 < 2.1 2.1 < 2.1 2.6 2.24 to 2.8 8.4
103 Hz D150 < 2.1 2.1 < 2.1 2.6 2.3 to 2.7 7.72772
106 Hz D150 < 2.1 2.1 < 2.1 2.6 2.3 to 2.5 6.43
Dissipation factor 60 Hz D150 < 0.0002 < 0.0002 < 0.0002 0.0006 0.0012 0.049
103 Hz D150 < 0.0002 < 0.0002 < 0.0002 0.0008 0.023 to 0.027 0.018
106 Hz D150 < 0.0002 < 0.0005 < 0.0003 0.005 0.009 to 0.017 0.17
Arc resistance Seconds D495 > 300 > 300 > 300 75 > 360 50 to 70
Durability Chemical resistance D543 Excellent Excellent Excellent Excellent Good Good
Flammability D635 Non-flammable Non-flammable Non-flammable Non-flammable Non-flammable Autolytic
Coefficient of water absorption % D570 < 0.01 < 0.01 0.03 0.029 0.00 0.04
Oxygen permeability O2 ml·mil
100 in2·24 hr·atm		 D1439 – 1050 985 148 – 4
Gas permeability N2 100 in2·24 hr·atm D1439 – 390 359 45 – 2
PRODUCT SPECIFICATIONS Flexible Hose